What is the pH of a solution containing 0.3 M Tris(hydroxymethyl)amino-methane (free base) and 0.2 M...
What is the pH of a solution containing 0.3 M Tris(hydroxymethyl)amino-methane (free base) and 0.2 M Tris hydrochloride? pka = 8.1
Homework Answers
Tris(hydroxymethyl)amino-methane is weak base and Tris hydrochloride is salt.
this is buffer solution.
for buffer solution,
Henderson equation is
POH = PKb + log [salt] / [base]
where C is the concentration of weak base.
PKa = 8.1
PKa + PKb = 14
PKb = 14 - PKa = 14 - 8.1 = 5.9
PKb = 5.9
POH = PKb + log [salt] / [base]
POH = 5.9 + log (0.2 / 0.3)
POH = 5.72
PH + POH = 14
PH = 14 - 5.72
PH = 8.28
PH of solution is 8.28.
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